for (int j = i + 1; j < n; j++) {
The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.
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值得一提的是，整场发布会，都由 Galaxy S26 Ultra 直播拍摄。
宇树科技（Unitree）：世界知名的民用机器人公司
Jimmy Kimmel wasn't a fan of Donald Trump's State of the Union address, but it sounds as though plenty of right-wing politicians and talking heads were.